CN113683337A - Preparation and use methods of additive for reducing concrete creep - Google Patents
Preparation and use methods of additive for reducing concrete creep Download PDFInfo
- Publication number
- CN113683337A CN113683337A CN202110972423.XA CN202110972423A CN113683337A CN 113683337 A CN113683337 A CN 113683337A CN 202110972423 A CN202110972423 A CN 202110972423A CN 113683337 A CN113683337 A CN 113683337A
- Authority
- CN
- China
- Prior art keywords
- agent
- minutes
- water
- concrete
- creep
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a preparation method and a use method of an additive for reducing concrete creep. The additive consists of an agent A and an agent B. The agent A is composed of Ti3C2、Fe3O4@SiO2The nanometer microsphere and dispersing agent F1 (sodium fatty alcohol polyoxyethylene ether sulfate and sodium polymethacrylate), when in use, Ti is required to be added3C2、Fe3O4@SiO2Mixing the nano-microspheres with water, stirring for 5 minutes, then ultrasonically dispersing for 10 minutes, and finally adding a dispersing agent F1 and stirring again for 10 minutes; the B agent consists of hydroxyapatite super-long nano-wires and a dispersing agent F2 (lauric acid and sodium dodecyl benzene sulfonate), and when the B agent is used, the hydroxyapatite super-long nano-wires and the dispersing agent F2 are mixed with water, stirred for 5 minutes and then ultrasonically dispersed for 20 minutes. The agent A and the agent B are used in combination, so that the concrete creep can be effectively reduced.
Description
Technical Field
The invention relates to a preparation method and a use method of an additive for reducing concrete creep, belongs to the technical field of building materials, and can effectively reduce the concrete creep.
Background
The phenomenon that deformation gradually increases with time under the action of a load is called creep of concrete. Concrete creep is usually 1-3 times of instantaneous deformation, so that excessive creep has important influence on the safety and service life of a concrete structure.
Factors influencing the creep size of concrete are many, such as temperature, humidity, loading age, hydration degree of a cementing material, elastic modulus, admixture and the like. Various methods have been developed to reduce creep in concrete. For example, the addition of the fly ash can effectively reduce creep, and researches show that because the fly ash can play a 'micro-aggregate effect', the addition of a proper amount of fly ash into concrete has an obvious inhibiting effect on early creep; the creep coefficient of the concrete is reduced after the fiber is added into the concrete, so the fiber can also obviously reduce the creep of the concrete.
The creep of concrete mainly comes from the creep of cement slurry, and a large number of scholars study cement hydration products by a nano indentation method, and characterize the creep size of different hydration products by using the creep modulus, wherein the larger the creep modulus is, the smaller the creep is. Research results show that the creep modulus of each hydration product of the cement is low-density C-S-H gel, high-density C-S-H gel, calcium hydroxide and unhydrated cement particles in sequence from low to high, and the creep modulus of the calcium hydroxide and the unhydrated cement particles is far higher than that of the C-S-H gel, which indicates that the creep of the C-S-H gel is higher than that of other products. Therefore, changing the amount and microstructure of the C-S-H gel to increase its creep modulus and reduce creep is an effective method for reducing concrete creep.
Based on the principle, the invention provides a preparation method and a use method of an additive capable of effectively reducing concrete creep. The invention takes nano material as raw material, takes the enhancement of the deformation resistance of C-S-H gel as a means, and reduces the creep of the concrete through the synergistic effect of the local enhancement and the integral enhancement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the excessive creep of the concrete can generate adverse effects on the safety and the service life of the structure, so that the invention modifies the cement hydration core product C-S-H gel through the nano material, enhances the creep resistance of the cement hydration core product C-S-H gel, and further reduces the creep of the concrete.
The technical scheme of the invention is as follows:
1. the special nano material: t with a particle size of 30-40 μmi3C2(ii) a A hydroxyapatite super-long nanowire with the diameter of 10-100nm and the length of 100 and 200 mu m; fe with particle size of 80-250nm3O4@SiO2Nano-microspheres;
2. special dispersant: the dispersing agent is divided into two types, and the dispersing agent F1 consists of fatty alcohol-polyoxyethylene ether sodium sulfate and sodium polymethacrylate; the dispersing agent F2 consists of lauric acid and sodium dodecyl benzene sulfonate;
3. the creep-reducing admixture comprises the following components:
the agent consists of an agent A and an agent B, and comprises the following specific components:
(1) the agent A is composed of Ti3C2、Fe3O4@SiO2The nano-microsphere and the dispersing agent F1 are mixed with water for use. The mass ratio of each component is Ti3C2：Fe3O4@SiO2Nano-microspheres: dispersant F1: water ═ (0.1-0.5): (1-3): (3-6): 100. the mass ratio of the fatty alcohol-polyoxyethylene ether sodium sulfate to the sodium polymethacrylate in F1 is 1: 1;
(2) the agent B consists of a hydroxyapatite ultralong nanowire and a dispersing agent F2 and needs to be mixed with water for use. The mass ratio of the components is as follows: dispersant F2: water ═ (0.5-1): (1-5):100. The mass ratio of lauric acid to sodium dodecyl benzene sulfonate in F2 is 1: 1.5;
4. the use method of the admixture comprises the following steps:
mixing Ti3C2And Fe3O4@SiO2Mixing the nano-microspheres with water, stirring for 5 minutes, then ultrasonically dispersing for 10 minutes, finally adding a dispersing agent F1, and stirring again for 10 minutes to prepare a dispersing solution of an agent A;
mixing the hydroxyapatite ultra-long nanowire and a dispersing agent F2 with water, stirring for 5 minutes, and then carrying out ultrasonic dispersion for 20 minutes to prepare a dispersion liquid of an agent B;
the dispersion liquid of the agent A and the dispersion liquid of the agent B are used in a combined way, when concrete is stirred, the dispersion liquid of the additive A is firstly added, the doping amount of the agent A is 0.5-2.5% of the mass of the cementing materials in the concrete, the mixture is stirred for 30 seconds, then the dispersion liquid of the additive B is added, the doping amount of the agent B is 0.5-1.5% of the mass of the cementing materials in the concrete, and the mixture is stirred uniformly.
Compared with the prior art, the invention has the following advantages:
(1) the invention uses the nano material to modify the C-S-H gel structure, thus fundamentally changing the creep property of the concrete;
(2)Ti3C2and Fe3O4@SiO2The nano-microspheres are granular, and after being doped into concrete, the nano-microspheres and C-S-H around the nano-microspheres locally form a composite material with stronger deformation resistance;
(3) the hydroxyapatite super-long nanowire is fibrous and has a large slenderness ratio, a three-dimensional network structure can be formed in the C-S-H, and the creep resistance of the C-S-H can be obviously improved.
Detailed Description
In order to further embody the efficacy of the present invention, the present invention is further described in detail with reference to specific application cases. The examples are divided into two types of concrete, C30 and C60.
The reference blending ratio of C30 concrete is shown in Table 1 (unit: kg/m)3)：
TABLE 1C30 reference concrete mixing ratio
The reference blending ratio of C60 concrete is shown in Table 2 (unit: kg/m)3)：
TABLE 2C60 concrete Standard mix proportions
The material parameters are as follows:
(1) the specification of the cement is P.O.42.5;
(2) the specification of the fly ash is F class II grade;
(3) the specification of the mineral powder is S95 grinding;
(4) the specific surface area of the silica fume is 18m2Per g, silicaThe content is more than 92 percent;
(5) the particle size of the stones is 5mm-25 mm; (6) the type of the water reducing agent is a polycarboxylic acid water reducing agent, the solid content is 20 percent, and the water reducing efficiency is 30 percent.
The cement, the silica fume, the fly ash and the mineral powder are collectively called as a cementing material. The C60 concrete only had cement as the cementitious material.
Example 1:
(1) the concrete proportion is as follows: c30;
(2) the admixture comprises the following components:
the A agent comprises:
①Ti3C2quality: c30, which accounts for 0.1% of half of the water by mass;
② Fe with particle size of 80nm3O4@SiO2The mass of the nano microspheres is as follows: c30, which is 3% of half of the water in proportion;
③ dispersing agent F1: c30, which is 3% of half of the water in proportion;
the mass of the agent A is 1.61 percent of the mass of the cementing material;
the component B is as follows:
fourthly, the quality of the hydroxyapatite ultra-long nanowire is as follows: c30, which accounts for 0.5 percent of half of the mass of the water;
fifth, dispersant F2 is prepared by the following mass: c30, which is 3% of half of the water in proportion;
the mass of the agent B is 0.92 percent of the mass of the cementing material;
(3) preparation of external additive dispersion liquid:
dividing the C30 into 2 parts horizontally, and preparing the A agent dispersion and the B agent dispersion respectively;
preparation of agent A dispersion liquid: mixing Ti3C2、Fe3O4@SiO2Mixing the nano-microspheres with water, stirring for 5 minutes, then ultrasonically dispersing for 10 minutes, and finally adding a dispersing agent F1 and stirring again for 10 minutes;
preparing B agent dispersion liquid: mixing the hydroxyapatite ultra-long nanowire and a dispersing agent F2 with water, stirring for 5 minutes, and then carrying out ultrasonic dispersion for 20 minutes;
(4) preparation and test of concrete creep test pieces: putting the measured materials such as cement sand stone and the like into a stirring pot, and stirring for 2 minutes; then adding the dispersion liquid of the agent A, and stirring for 30 seconds; then adding the dispersion liquid of the agent B, and stirring uniformly; then pouring the mixture into a mold with the thickness of 100mm multiplied by 400mm for curing for 28 d; after curing, creep tests were carried out in accordance with Standard test methods for Long-term Performance and durability of ordinary concrete, and creep deformation values were measured at 30d, 60d, 90d, 180d and 360 d.
Example 2:
(1) the concrete proportion is as follows: c30;
(2) the admixture comprises the following components:
the A agent comprises:
①Ti3C2quality: c30, which accounts for 0.5 percent of half of the mass of the water;
② Fe with 130nm particle size3O4@SiO2The mass of the nano microspheres is as follows: c30, 1% of half of the water by mass;
③ dispersing agent F1: c30, which is 3% of half of the water in proportion;
the mass of the agent A is 1.19 percent of the mass of the cementing material;
the component B is as follows:
fourthly, the quality of the hydroxyapatite ultra-long nanowire is as follows: c30, which accounts for 0.8% of half of the water by mass;
fifth, dispersant F2 is prepared by the following mass: c30, 4% of half of the water in proportion;
the mass of the agent B is 1.27 percent of the mass of the cementing material;
(3) preparation of external additive dispersion liquid:
dividing the C30 into 2 parts horizontally, and preparing the A agent dispersion and the B agent dispersion respectively;
preparation of agent A dispersion liquid: mixing Ti3C2、Fe3O4@SiO2Mixing the nano-microspheres with water, stirring for 5 minutes, then ultrasonically dispersing for 10 minutes, and finally adding a dispersing agent F1 and stirring again for 10 minutes;
preparing B agent dispersion liquid: mixing the hydroxyapatite ultra-long nanowire and a dispersing agent F2 with water, stirring for 5 minutes, and then carrying out ultrasonic dispersion for 20 minutes;
(4) preparation and test of concrete creep test pieces: putting the measured materials such as cement sand stone and the like into a stirring pot, and stirring for 2 minutes; then adding the dispersion liquid of the agent A, and stirring for 30 seconds; then adding the dispersion liquid of the agent B, and stirring uniformly; then pouring the mixture into a mold with the thickness of 100mm multiplied by 400mm for curing for 28 d; after curing, creep tests were carried out in accordance with Standard test methods for Long-term Performance and durability of ordinary concrete, and creep deformation values were measured at 30d, 60d, 90d, 180d and 360 d.
Example 3:
(1) the concrete proportion is as follows: c60;
(2) the admixture comprises the following components:
the A agent comprises:
①Ti3C2quality: c60, which accounts for 0.3% of half of the water by mass;
② Fe with 130nm particle size3O4@SiO2The mass of the nano microspheres is as follows: c60, 2% of half of the water in proportion;
③ dispersing agent F1: c60, 4% of half of the water in proportion;
the mass of the agent A is 0.84 percent of the mass of the cementing material;
the component B is as follows:
fourthly, the quality of the hydroxyapatite ultra-long nanowire is as follows: c60, which accounts for 0.5 percent of half of the mass of the water;
fifth, dispersant F2 is prepared by the following mass: c60, 5% of half of the water in proportion;
the mass of the agent B is 0.74 percent of the mass of the cementing material;
(3) preparation of external additive dispersion liquid:
dividing the C60 into 2 parts horizontally, and preparing the A agent dispersion and the B agent dispersion respectively;
preparation of agent A dispersion liquid: mixing Ti3C2、Fe3O4@SiO2Mixing the nano-microspheres with water, stirring for 5 minutes, then ultrasonically dispersing for 10 minutes, and finally adding a dispersing agent F1 and stirring again for 10 minutes;
preparing B agent dispersion liquid: mixing the hydroxyapatite ultra-long nanowire and a dispersing agent F2 with water, stirring for 5 minutes, and then carrying out ultrasonic dispersion for 20 minutes;
(4) preparation and test of concrete creep test pieces: putting the measured materials such as cement sand stone and the like into a stirring pot, and stirring for 2 minutes; then adding the dispersion liquid of the agent A, and stirring for 30 seconds; then adding the dispersion liquid of the agent B, and stirring uniformly; then pouring the mixture into a mold with the thickness of 100mm multiplied by 400mm for curing for 28 d; after curing, creep tests were carried out in accordance with Standard test methods for Long-term Performance and durability of ordinary concrete, and creep deformation values were measured at 30d, 60d, 90d, 180d and 360 d.
Example 4:
(1) the concrete proportion is as follows: c60;
(2) the admixture comprises the following components:
the A agent comprises:
①Ti3C2quality: c60 is 0.4 percent of half of the water by mass;
② Fe with particle size of 250nm3O4@SiO2The mass of the nano microspheres is as follows: c60, which is 3% of half of the water in proportion;
③ dispersing agent F1: c60, 5% of half of the water in proportion;
the mass of the agent A is 1.12 percent of the mass of the cementing material;
the component B is as follows:
fourthly, the quality of the hydroxyapatite ultra-long nanowire is as follows: c60, 1% of half of the water by mass;
fifth, dispersant F2 is prepared by the following mass: c60, 4% of half of the water in proportion;
the mass of the agent B is 0.67 percent of the mass of the cementing material;
(3) preparation of external additive dispersion liquid:
dividing the C60 into 2 parts horizontally, and preparing the A agent dispersion and the B agent dispersion respectively;
preparation of agent A dispersion liquid: mixing Ti3C2、Fe3O4@SiO2Mixing the nano-microspheres with water, stirring for 5 minutes, then ultrasonically dispersing for 10 minutes, and finally adding a dispersing agent F1 and stirring again for 10 minutes;
preparing B agent dispersion liquid: mixing the hydroxyapatite ultra-long nanowire and a dispersing agent F2 with water, stirring for 5 minutes, and then carrying out ultrasonic dispersion for 20 minutes;
(4) preparation and test of concrete creep test pieces: putting the measured materials such as cement sand stone and the like into a stirring pot, and stirring for 2 minutes; then adding the dispersion liquid of the agent A, and stirring for 30 seconds; then adding the dispersion liquid of the agent B, and stirring uniformly; then pouring the mixture into a mold with the thickness of 100mm multiplied by 400mm for curing for 28 d; after curing, creep tests were carried out in accordance with Standard test methods for Long-term Performance and durability of ordinary concrete, and creep deformation values were measured at 30d, 60d, 90d, 180d and 360 d.
Test results
C30 and C60 are respectively provided with a group of control tests, the mixture ratio is a reference mixture ratio, no additive is added, and the forming, curing and testing methods are the same as the examples. The results of the control and the examples are shown in tables 3 and 4.
TABLE 3C30 concrete creep test results
TABLE 4C60 concrete creep test results
Creep test results of C30 concrete show that creep strains of examples 1 and 2 at 30d, 60d, 90d, 180d and 360d are always lower than those of a control group, and creep strain reduction of examples 1 and 2 at 360d can reach 12.8% and 13.9%; the test results for the C60 concrete were similar to C30, with examples 3 and 4 showing significantly lower creep strain at the corresponding test days than the control, and with creep strain drops of 11.4% and 14.7% at 360 d. Examples 1-4 illustrate the significant effect of the invention on creep of concrete; on the other hand, creep strains between example 1 and example 2, and between example 3 and example 4 are not very different, which shows that the invention has stability and does not change obviously along with the change of the mixture ratio.
Claims (2)
1. The admixture for reducing the creep of concrete is characterized by comprising the following components in percentage by weight:
(1) the special nano material: ti with a particle size of 30-40 μm3C2(ii) a A hydroxyapatite super-long nanowire with the diameter of 10-100nm and the length of 100 and 200 mu m; fe with particle size of 80-250nm3O4@SiO2Nano-microspheres;
(2) special dispersant: the dispersing agent is divided into two types, and the dispersing agent F1 consists of fatty alcohol-polyoxyethylene ether sodium sulfate and sodium polymethacrylate; the dispersing agent F2 consists of lauric acid and sodium dodecyl benzene sulfonate;
(3) the creep-reducing admixture comprises the following components:
the agent consists of an agent A and an agent B, and comprises the following specific components:
the agent A is composed of Ti3C2、Fe3O4@SiO2The nano-microsphere and the dispersing agent F1 are mixed with water for use; the mass ratio of each component is Ti3C2：Fe3O4@SiO2Nano-microspheres: dispersant F1: water ═ (0.1-0.5): (1-3): (3-6): 100, respectively; the mass ratio of the fatty alcohol-polyoxyethylene ether sodium sulfate to the sodium polymethacrylate in F1 is 1: 1;
the agent B consists of a hydroxyapatite ultralong nanowire and a dispersant F2 and needs to be mixed with water for use; the mass ratio of the components is as follows: dispersant F2: water ═ (0.5-1): (1-5) 100; the mass ratio of lauric acid to sodium dodecyl benzene sulfonate in F2 is 1: 1.5.
2. A method of using the admixture of claim 1, wherein:
mixing Ti3C2And Fe3O4@SiO2Mixing the nano-microspheres with water, stirring for 5 minutes, then ultrasonically dispersing for 10 minutes, finally adding a dispersing agent F1, and stirring again for 10 minutes to prepare a dispersing solution of an agent A;
mixing the hydroxyapatite ultra-long nanowire and a dispersing agent F2 with water, stirring for 5 minutes, and then carrying out ultrasonic dispersion for 20 minutes to prepare a dispersion liquid of an agent B;
the dispersion liquid of the agent A and the dispersion liquid of the agent B are used in a combined way, when concrete is stirred, the dispersion liquid of the additive A is firstly added, the doping amount of the agent A is 0.5-2.5% of the mass of the cementing materials in the concrete, the mixture is stirred for 30 seconds, then the dispersion liquid of the additive B is added, the doping amount of the agent B is 0.5-1.5% of the mass of the cementing materials in the concrete, and the mixture is stirred uniformly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110972423.XA CN113683337B (en) | 2021-08-24 | 2021-08-24 | Preparation and application methods of admixture for reducing concrete creep |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110972423.XA CN113683337B (en) | 2021-08-24 | 2021-08-24 | Preparation and application methods of admixture for reducing concrete creep |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113683337A true CN113683337A (en) | 2021-11-23 |
| CN113683337B CN113683337B (en) | 2023-05-23 |
Family
ID=78581669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110972423.XA Active CN113683337B (en) | 2021-08-24 | 2021-08-24 | Preparation and application methods of admixture for reducing concrete creep |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113683337B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1621384A (en) * | 2003-11-28 | 2005-06-01 | 西北农林科技大学 | Nanometer based concrete modifier |
| CN105461274A (en) * | 2015-11-24 | 2016-04-06 | 绍兴文理学院 | Low-creep concrete |
-
2021
- 2021-08-24 CN CN202110972423.XA patent/CN113683337B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1621384A (en) * | 2003-11-28 | 2005-06-01 | 西北农林科技大学 | Nanometer based concrete modifier |
| CN105461274A (en) * | 2015-11-24 | 2016-04-06 | 绍兴文理学院 | Low-creep concrete |
Non-Patent Citations (4)
| Title |
|---|
| ELZBIETA HORSZCZARUK等: "Mechanical properties cement based composites modified with nano-Fe3O4/SiO2", 《CONSTRUCTION AND BUILDING MATERIALS》 * |
| JIANPING ZHU等: "Effect of Delaminated MXene (Ti3C2) on the Performance of Cement Paste", 《JOURNAL OF NANOMATERIALS》 * |
| 姚武等: "水化硅酸钙凝胶的弹塑性和徐变特性", 《材料研究学报》 * |
| 张巨松主编: "《混凝土学》", 30 June 2017, 哈尔滨工业大学出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113683337B (en) | 2023-05-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | Rheological and mechanical properties of microfine-cement-based grouts mixed with microfine fly ash, colloidal nanosilica and superplasticizer | |
| Haruehansapong et al. | Effect of the particle size of nanosilica on the compressive strength and the optimum replacement content of cement mortar containing nano-SiO2 | |
| Ltifi et al. | Experimental study of the effect of addition of nano-silica on the behaviour of cement mortars | |
| CN108585679B (en) | Low-shrinkage green UHPC and preparation method thereof | |
| Bolhassani et al. | Effect of type, size, and dosage of nanosilica and microsilica on properties of cement paste and mortar | |
| CN113336508A (en) | Self-compacting concrete and construction method thereof | |
| CN110304857B (en) | Nano cement-based crystal nucleus type early strength agent and preparation method and application thereof | |
| CN109503055A (en) | A kind of self-compacting concrete and preparation method thereof | |
| CN109665769B (en) | Super early-strength high-performance concrete and preparation method thereof | |
| Guefrech et al. | Experimental study of the effect of addition of nano-silica on the behaviour of cement mortars Mounir | |
| CN113480256B (en) | STC (super-high-temperature-coefficient) ultrahigh-toughness concrete with high working performance and production method thereof | |
| CN113480257A (en) | Ultrahigh-performance concrete with high breaking strength and preparation method thereof | |
| Zhang et al. | Mechanical properties of polyvinyl alcohol fiber-reinforced concrete composite containing fly ash and nano-SiO2 | |
| CN114394793B (en) | Modified polymer concrete and preparation method thereof | |
| CN112028570A (en) | Active powder grouting material and preparation method thereof | |
| CN110937868A (en) | Self-compacting hybrid fiber concrete and preparation method thereof | |
| CN110451885A (en) | A kind of high-strength superhigh-lift pump concrete viscosity reduction regulation method based on material particle size matched design | |
| Prithiviraj et al. | Influence of W/B ratio and chemical admixture on fresh and hardened properties of self compacting concrete using alccofine | |
| CN113683337B (en) | Preparation and application methods of admixture for reducing concrete creep | |
| CN111908825A (en) | Early strength type nano mineral admixture for concrete and preparation method thereof | |
| Bayasi et al. | Optimum use of pozzolanic materials in steel fiber reinforced concrete | |
| CN109574700B (en) | Dispersed fiber foam concrete and preparation method thereof | |
| CN112694301B (en) | Long-acting reduction type dolomite powder self-compacting concrete and preparation method thereof | |
| KR20120119676A (en) | Shrinkage-reducing and ultra high early strength cement binder composition and method for producing secondary goods of precast concrete using the same | |
| Zhang et al. | Combined effect of silica fume and polypropylene fiberon drying shrinkage properties of concrete composites containing fly ash |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |